Update open ethereum. (paritytech#290)

* Update open ethereum.

* Remove extra line break.

* Remove branch comment.

bridges/README.md

@@ -174,13 +174,13 @@ cargo build -p bridge-node
 cargo build -p ethereum-poa-relay
 ```
 
-Next you'll need to clone the following [fork of OpenEthereum](https://github.com/HCastano/parity-ethereum).
+Next you'll need to clone the following [fork of OpenEthereum](https://github.com/paritytech/openethereum).
 If you're doing development which only involves the Ethereum to Substrate side of the bridge you may
 use the `master` branch. Otherwise you'll need to checkout the `substrate-builtins-stubs` branch.
 
 ```bash
 # Should be at the same level as `parity-bridges-common` folder
-git clone https://github.com/HCastano/parity-ethereum.git openethereum
+git clone https://github.com/paritytech/openethereum.git openethereum
 git fetch
 git checkout substrate-builtins-stubs
 ```